feat(backend): default to smolmachines

examples/bottles/claude.md

@@ -13,4 +13,6 @@ egress:
 
 Common Claude provider boundary. Drop this file into
 `~/.bot-bottle/bottles/claude.md`, then extend it from task-specific
-bottles.
+bottles. The default smolmachines backend keeps DNS resolution under
+the VM-layer egress policy; use `BOT_BOTTLE_BACKEND=docker` only for
+legacy Docker-backed runs.

examples/bottles/dev.md

@@ -10,4 +10,5 @@ The `dev` bottle — backs a generic development workflow.
 
 Inherits the Claude provider boundary from `claude`. Drop this file
 into `~/.bot-bottle/bottles/dev.md` and any agent referencing
-`bottle: dev` will launch against this infrastructure.
+`bottle: dev` will launch against this infrastructure. By default,
+bot-bottle runs this bottle on the smolmachines backend.